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November 3, 2026

Senior .NET Developer

Senior • Remote

110 - 140 PLN/yr

Warsaw, Poland

Quick Facts

  • Role: Senior .NET Developer

Description

You will work on the modernization of an application, development of system integrations, and improving application security. Responsibilities include security hardening, upgrading data import/export mechanisms, migrating from DB Link connections to REST APIs, implementing MFA, and refactoring for performance and stability. You will also create unit and integration tests to support reliable releases.

Responsibilities

  • Identify and remediate application security vulnerabilities (security hardening)
  • Modernize data import/export mechanisms
  • Replace DB Link connections with REST API interfaces
  • Design and implement multi-factor authentication (MFA)
  • Refactor code and optimize application performance and stability
  • Build unit and integration tests

Requirements

  • Minimum 5 years of C#/.NET development experience
  • Very good knowledge of .NET Core / .NET 5+
  • Experience designing and developing REST APIs
  • Advanced knowledge of SQL and relational databases
  • Knowledge of application security topics: OWASP Top 10, OAuth2, OpenID Connect, and MFA
  • Experience integrating systems and processing data
  • Ability to modernize and refactor existing applications
  • Knowledge of Git and Jira or Azure DevOps
  • Independence and experience working in an Agile environment

Benefits

Not specified in the source text.

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